randomblink said:

1 - Yes.  Runebound & Card Expansions, Wings of War, Talisman, Arkham Horror, Tide of Iron, Game of Thrones LCG, LotR LCG, and Netrunner LCG.

2- See above.

3 - FFG is well known to produce some fantastic components.  Probably the best in the industry.  If Ameritrash is your thing, FFG is your nectar!

4 - Depends on the game.  I will say that every game gets errata if it's coming from a company that cares about their products and gamers.

My overall opinion.

+ Great customer support.

+ Nice range of products that appear to be well managed.  They weren't afraid to cut & run from Tide of Iron when it was apparent it was a turd.

+ Great group of in house designers and artists.  They also know when to contract artwork and to whom it should go.  The artwork in LotR and AGoT is amazingly good in many cases.

+ They always have a little something in the pipeline once you're in a system.

- Their printing / shipping schedules can be very unpredictable.

- Their prize support is very poor.

- The whole handling of the World Championship Weekend has been full of mistakes from the get go.

- Their reprint schedules for LCG packs can be hard to understand at times (particularly true in the AGoT LCG)

I have various different FFG products, and I have enjoyed all of them. Component wise they are usually terrific (though consequently quite pricey).

However, as some have mentioned, rules are a slightly dogey issue. Someone I know basically says "Don't buy first edition anything from FFG". Now, this is overstating it, but FFG doesn't write tight rules sets and their proof reading sometimes is bad (this is most commonly a problem with their big books, ie their RPGs, which always have errors in them). However, this usually doesn't make a game unplayable, and I generally find that if you play any abiguities how they feel they should work, you usually end up matching the errata/FAQ, usually showing the reason that something is not precisely stated is because they haven't realised there could be an awkward (but at least initially RAW) interpretation. I certainly wouldn't make it a reason not to buy a game, as I have never come across a crippling flaw, and they do errata things.

Have you purchased more than one game system from FFG? Yes

If you answered YES to #1, what are they?

Lessee…Anima, Battlestar Galactica, Cosmic Encounter, Elder Sign, Game of Thrones: LCG, Lord of the Rings: LCG, Netrunner LCG, and X-Wing. 

Are the games good quality materials? ( do they fall apart, fade, damage easily? )

I have not seen quality materials in many companies; this company is definitely among the top 5. 

Are the games well made 'games?' ( do they require a lot of errata, are they usually broken right off the shelf, do the rules make sense? ) 

Out of all the games I have, I'd say FFG has a knack of creating excessively complex and overly bogged down games. It's not to say that this is a bad thing, but it's not always a good thing. Most FFG-native games (not talking about any reprints) have far too much errata to really have a good time right out-of-the-box. Some games (such as Game of Thrones: LCG) need you to consult the online-available FAQ, which is sometimes bigger than the rule book. Unfortunately, I have stopped collecting Game of Thrones: LCG for this reason.

But once you "get it", the games are very deep and have many layers of gameplay. Battlestar Galactica is a great game when everyone is on the same level. The LCG lines are great…if you get in on the ground floor. I have played Warhammer: Invasion and am really curious about Call of Cthulhu, but because they have years of expansions already out, I feel like I'm really not getting the full experience and I'm not about to spend the hundreds of dollars to "get current". I just got X-Wing and I'm really liking it so far. Reprints are very well done. They certainly take it to the next level and if you want something to start with…Cosmic Encounter is a no brainer. 

But it's up to you. If you want longevity, get in on X-Wing and Netrunner while it's still new. 

 sounds like all youve played are RPGs and CCGs for the most part. I suggest trying to play a wide variety of other styles of boardgames, you may not realize how much variety is out there. I like a few FFG games I own, and love Netrunner especially, but glad to have a broad collection. FFG specializes in nice production values and theme heavy games, but there are lots of thinky interesting games that other companies do better.  i suggest finding a boardgame meetup and try stuff with victory points and wooden cubes to push around, its very different that role playing or strategy card gaming.